diff --git a/resources/shaders/accum.cl b/resources/shaders/accum.cl
index b704bb61..e9e71a4d 100644
--- a/resources/shaders/accum.cl
+++ b/resources/shaders/accum.cl
@@ -31,8 +31,8 @@ __kernel void accum(__write_only image2d_t gImage,
         int2 coord = (int2)((int)column, (int)row);
         coverage += read_imagef(gCoverage, SAMPLER, coord).r;
 
-        uint gray = convert_uint(clamp(fabs(coverage), 0.0f, 1.0f) * 255.0f);
-        write_imageui(gImage, coord + (int2)kAtlasRect.xy, (uint4)(gray, 255, 255, 255));
+        float gray = fabs(coverage);
+        write_imagef(gImage, coord + (int2)kAtlasRect.xy, (float4)(gray, 1.0f, 1.0f, 1.0f));
     }
 }